Young — Note on Aseotropic Mixtures. 



27 



much higher than that of the binary aleohol-hexane mixture. The A.H.W. 

 curve, as drawn, intersects the vertical H.W. boiling point line at about 109°, 

 but the observed boiling points are not sufficiently numerous or regular to 

 allow of the curve being extrapolated with mucli confidence. If the curve 

 were correctly drawn, it would appear that isobutyl alcohol should form 

 a ternary azeotropic mixture, but, according to Lecat, it does not. Probably, 

 therefore, the curve should be somewhat flattei'. It seems probable that 

 tertiary amyl alcohol (5) should form a ternary mixture, but the boiling point 

 of the binary A.H. mixture is slightly higher than that of the isobutyl 

 aleohol-hexane mixture, and the matter can only be decided by experiment. 



120- 



iOO 



80 



60 



1 



Alcoliol. 



1 





1 1 



1 



- n-Sulyl 



^ 



^ 



^ 





o 



-Iso-Bulyl 



• 



-»»■' 





9' 



-Terl.Amyl 

 ^Sec. Butyl 



- TL-Propyl 



STert.Butyl 

 ~V Iso-Propyl 



- Etliyf 



o 



-V 



CO 



' 

 •'0 - 



•o 



-Methyl ,<^''' 



" 







1 



1 



1 1 



1 



50 



60 



YO 



RO 



90 



Fio. 1. 



It is certain, at any rate, that no alcohol boiling at a temperature higher 

 than 108° can form a ternary mixture with hexane and water-. 



The benzene mixtures have been more thoroughly investigated than 

 any others. The point of intersection of the A.B. curve (fig. 2) with the 

 vertical benzene boiling-point line is at about 109°. Isobutyl alcoliol, and all 

 alcohols of lower boiling point, should, apparently, form binary mixtures 

 with benzene; but, as with hexane, the tertiary amyl alcohol mixture, 

 if it actually exists, has a slightly higher boiling point than the isobutyl 

 alcohol mixture. It is uncertain whether it has really been obtained. 

 No alcohol boiling at a higher temperature than 108° should form a binary 

 mixture with benzene. 



